Waiting Time Before Revision Blepharoplasty?

Typically, most surgeons would wait about six months. However, the main factor is the status of the lower eyelid. In general, you should not reoperate until the incision and the lid itself feels like normal tissue again. It should not be firm or swollen or another surgery could cause further problems.
If the eyelid is not in the right position, this can often improve significantly with massage and time. However, if you are a quick healer and the eyelid feels completely normal at 4 months and you want to consider revision work, then there should be nothing stopping you. Just be sure to discuss all you concerns with your surgeon. Good luck.
Dr. Miller

Revision Surgery

Revision eyelid surgery should be done at least 6 months
after the initial surgery to allow time for healing and tissues to soften. Asymmetries, excess skin, fat rolls, fat malposition can all be improved. Other treatments may include laser or
chemical peels to tighten skin and improve texture

It is never a good idea to revise eyelid surgery too soon. Though it is infrequent, I would typically recommend waiting 6-12 months before considering any eyelid revision, especially in the lower lids. Early re-operation increase the risks of the surgery and can result in bigger problems. There can be prolonged swelling, scar deformity and eyelid distortion if the eyelid is not completely healed and the scar tissue hasn't matured before revision surgery.
Patience is the best approach in this situation. Be sure to talk with your surgeon about your concerns, but do not pressure him/her to re-operate too soon. You may see significant improvement in the result over time, and you will be much safer by waiting. There may be situations where corrective surgery is recommended earlier than 6 months, though rare, that usually is only if the result is putting the eye at risk for other problems.